Creamy Hash Brown Casserole

INGREDIENTS

• 1/2 teaspoon garlic powder
• 1/4 cup butter, plus more for dish
• 1 (30-ounce) package frozen shredded hash brown potatoes, thawed
• 1 (8-ounce) package shredded Cheddar and Monterey Jack cheese blend
• 1 teaspoon salt
• 2 cups crushed potato chips
• 1/2 teaspoon ground black pepper
• 1 (16-ounce) container sour cream
• 1 onion, chopped
• 1 (10 1/2-ounce) can cream of celery soup